Do you really suck things up through a straw?

Question

My Dad always said that it's inpossible, that we actually remove gravity. Is this true?

Answer 1

of course you suck through a straw..

and gravity does not get removed, unless you remove the source of the gravitational source, namely the earth and you..
what really happen is that you creat a vacuum inside your mouth by removing air away, hence making it possible for fluid to move up the straw..
you can also make a vacuum inside a tin can or a bottle if you remove air by heating vapor away, heat expands, and evaporates, when you cool it quickly it creates an instant vacuum..

Answer 2

Great question. I'll start by saying nothing "sucks" in science.

It is all about the movement from high pressure to low pressure.

Here is how it works:

There is atmospheric pressure acting on the top of the soda. When you put your mouth to the straw and expand your lungs, you create a low pressure inside your lungs. As a result, the air that is trapped in the straw moves to your lungs, thus creating a low pressure in the straw.

Now the pressure in the straw is less than the atmospheric pressure that is pushing on the surface of the soda, so the soda is literally pushed up the straw by the atmosphere.

Try "sucking" on a straw when the soda is sealed off from the atmosphere. That is impossible no matter how hard you "suck."

In fact, another cool thing to this that shows it isn't the sucking power, but the weight of the atmosphere pushing the liquid has to do with vacuum pumps. You could have the strongest vacuum pump in the world try to "suck" water up hundreds of feet of straw. However, the water will only go about 10.3 meters, and then stop. This is because the pressure from water with a height of 10.3 meters is equal to that of normal atmospheric pressure. It has nothing to do with how strong the vacuum pump is.

Answer 3

What happens is we change the pressure exerted on that surface of the liquid inside the straw. The air pressure outside the straw then pushes down on the liquid, making a column of liquid inside the straw rise to try to achieve equilibrium. If we keep sucking on the straw, equilibrium is not met until out mouth is full and we remove the straw from our mouth, or until the cup is empty enough to allow air to flow through the straw.

Answer 4

Your dad is right. The reason liquids go up a straw is that you have just sucked the air pressure out of the inside of the straw and atmospheric pressure pressing down on the surface of your drink is doing the work to push the liquid up the straw.

Answer 5

All you're doing is reducing the air pressure inside the straw. The air pressure on the water in the cup is higher and forces the water higher in the straw. Blow in the straw to make the air pressure higher in the straw and force the water lower. If you were in a vacuum, you couldn't suck anything up through a straw.

Answer 6

/wjeij ikjr

Answer 7

wtf are you snorting...errr...sucking through your straw??????